keep one's knickers on

Verb

idiomatic imperative slang

(idiomatic, slang, chiefly imperative) To stay calm; to not get flustered or angry.

Japanese Meaning

落ち着いて行動する、慌てずに冷静さを保つ / 怒りや焦燥心に支配されず、平常心を維持する

In a crisis, it's wise to keep one's knickers on and think clearly.

危機のときには、冷静でいることが大切で、はっきり考えるのが賢明だ。

Sense（1）

(idiomatic, slang, chiefly imperative) To stay calm; to not get flustered or angry.

Keep your knickers on, mate. It was only a joke.

keeps one's knickers on

（ present singular third-person ）

keeping one's knickers on

（ participle present ）

kept one's knickers on

（ participle past ）

kept one's knickers on

（ past ）